Full app rebuild: FastAPI backend + React Native mobile with auth, championships, admin

Backend (FastAPI + SQLAlchemy + SQLite):
- JWT auth with access/refresh tokens, bcrypt password hashing
- User model with member/organizer/admin roles, auto-approve members
- Championship, Registration, ParticipantList, Notification models
- Alembic async migrations, seed data with test users
- Registration endpoint returns tokens for members, pending for organizers
- /registrations/my returns championship title/date/location via eager loading
- Admin endpoints: list users, approve/reject organizers

Mobile (React Native + Expo + TypeScript):
- Zustand auth store, Axios client with token refresh interceptor
- Role-based registration (Member vs Organizer) with contextual form labels
- Tab navigation with Ionicons, safe area headers, admin tab for admin role
- Championships list with status badges, detail screen with registration progress
- My Registrations with championship title, progress bar, and tap-to-navigate
- Admin panel with pending/all filter, approve/reject with confirmation
- Profile screen with role badge, Ionicons info rows, sign out
- Password visibility toggle (Ionicons), keyboard flow hints (returnKeyType)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/main.py

@@ -0,0 +1,41 @@
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.config import settings
+from app.routers import auth, championships, registrations, participant_lists, users
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    # Start Instagram sync scheduler if configured
+    if settings.INSTAGRAM_USER_ID and settings.INSTAGRAM_ACCESS_TOKEN:
+        from app.services.instagram_service import start_scheduler
+        scheduler = start_scheduler()
+        yield
+        scheduler.shutdown()
+    else:
+        yield
+
+
+app = FastAPI(title="Pole Dance Championships API", version="1.0.0", lifespan=lifespan)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.cors_origins_list,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.include_router(auth.router, prefix="/api/v1/auth", tags=["auth"])
+app.include_router(users.router, prefix="/api/v1/users", tags=["users"])
+app.include_router(championships.router, prefix="/api/v1/championships", tags=["championships"])
+app.include_router(registrations.router, prefix="/api/v1/registrations", tags=["registrations"])
+app.include_router(participant_lists.router, prefix="/api/v1", tags=["participant-lists"])
+
+
+@app.get("/internal/health", tags=["health"])
+async def health():
+    return {"status": "ok"}